Manufacture of acid and water proof cement.



COMPOSITIONS, COATING OR PLASTIC.

- cxzmmr UNITED STATES PATENT OFFICE.

CURTIS C. MEIGS, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO ELECTRO- CHEMICAL SUPPLY & ENGINEERING COMPANY, OF PHILADELPHIA, PENNSYL- VANIA, A CORPORATION OF PENNSYLVANIA.

MANUFACTURE OF ACID AND WATER PROOF CEMENT.

No Drawing.

To all whom it may concern:

Be it known that I, CURTIS C. MEIGs, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in the Manufacture of Acid and IVater Proof Cement, of which the following is aspecification.

My invention relates to that method of producing an acid and water proof cement which consists in mixing crystalline silica, such as round uartz. diatomaceous earth or the 11l e, with sodium silicate the ob ect of my invention Being to so prepare such a cement that subsequent exposure to water not only does not disintegrate or soften the cement but has the effect of hardening the ../same.

It has previously been proposed to produce a water and acid proof cement by add- 520 ing to the silicious material an acid which I would, on the later addition so ium silicate, act as a precipitant of finely divided silica in the cement. -I have since found that the waterproof 25 qualities of the cement can be materially enhanced by adding to the silicious material before the sodium silicate is added thereto, about ten per cent. of a )atite or ure' calcium hos hate. The resu t 0 $1101 a difion is that the subsequent action of the acid results in the production of a cement Specification of Letters Patent.

which, when exposed to water, increases in he action of the acid upon the calcium 3 5 phosphate produces hos )horic acid, which reacts upon the silica-sodium silicate complex due to the combination of silica and sodium silicate in such a way as to form a The acid used is preferably one to which it is thereafter proposed to subject the structure made from the cement.

mass which is i 1e r le. insoluble anc inert 1n the presence of water in iout osmg Patented Nov. 6, 1917.

Application filed July 12, 1915. Serial No. 39,369.

react upon the silica-sodium sillcate complex in the manner described.

I claim 1. As an improvement in the manufacture of acid and water proof cement by mixing silicious material and sodium silicate, the mode herein described of increasing the water resisting property of the cement, said mode consisting in adding to the mixture of sodium silicate and silicious material an acid salt, and then subjecting the mixture to the action of an acid that will react upon the silica-sodium silicate complex.

2. As an improvement in the manufacture of acid and water proof cement by mixing silicious material and sodium silicate, the mode herein described of increasing the water resisting property of the cement, said mode consisting in adding to the mixture of sodium silicate and silicious material an acid salt, and then subjecting the mixture to the action of an acid that will form an acid having said salt as a base for reaction upon the silica-sodium silicate complex.

3. As an improvement in the manufacture of acid and water proof cement by mixing silicious material and sodium silicate, the mode herein described of increasing the water resisting property of the cement, said mode consisting in adding calcium phosphate to the silicious material and sodium silicate, and subsequently subjecting the mixture to the action of an acid that will produce phosphoric acid for reaction upon the silica-sodium silicate complex.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

CURTIS o. MEIGS.

Witnesses:

KATE A. BEADLE, HAMILTON D. TURNER.

Copies of this patent may be obtained for five cents each, by addressing the "commissioner of Patente, Washington, D. 0. 

